It acknowledges that a line in the sand must be drawn on what would occupy any organism capable of sufficiently complex thought. It's also an implementation convenience in that a new letter doesn't have to be substituted where generic parameterisation is called for.
Both cute and realistic.
Being derived from the Latin "reductio ad absurdum", the term carries connotations of formality, and also perhaps underscores the utter silliness of the concept's philosophical direction: a contemplative singularity. Its plural would be "Absurda" and the collective noun might be a "Silliness" of Absurda.
This term also acknowledges the humorous event horizon encircling the purpose of the Account too. Great!